AfterLogic WebMail Lite PHP

Why WebMail Lite?

Open Source and Free

Install it on your web servers for personal or commercial use, redistribute, integrate with other software, or alter the source code (provided that you contribute your changes back to the community). For free.

Full-featured

Minimalistic interface is combined with a rich feature set, no tradeoffs here. Built on the latest HTML5 and CSS3 technology.